7 Speed cassettes require a spacer to eat up extra width
(approximately 4mm) of the hub body since it is 4mm narrower than 8-10
speed cassettes. Wheelset is NOT compatible with multi-speed or single
speed freewheels. Cassette compatible ONLY. Wheelset is not compatible
for fixed gear use.

Compatible tire widths would start at 23mm wide (700 x 23c) and
all the way up to around 48mm wide (700 x 48c)